On Thu, 25 Mar 2021 19:51:42 +0100 Nicolas George <geo...@nsup.org> wrote:
> Greg Wooledge (12021-03-25): > > However, this is NOT something you can do with MP3 files. They are not > > designed to be concatenated. (Ogg Vorbis files *are*. MP3 files aren't.) > > It's the other way around. Pure MP3 files are just a concatenation of > self-delimited packets, concatenation will just work. > > MP3 files will usually have ID3 and/or XING packets for metadata at the > beginning or the end, concatenation will include them, and the metadata > will be invalid, but it will not prevent the file from being played. > > On the other hand, Ogg files are NOT concatenable, even those that > contain only Vorbis audio. Some player will ignore the discontinuity at > the concatenation points, but not all. > > Also, let it be said that: decoding playing, recording and encoding > audio files to concatenate them is a terrible idea, because it will lose > quality both because of the decoding-encoding step and because of the > numeric-analog-numeric step. The FFmpeg wiki has some very useful information on concatenating media files where a simple 'cat' won't work - I use its 'concat demuxer' regularly to contatenate MP4 files (Android starts a new video file when a 4GB limit is hit): https://trac.ffmpeg.org/wiki/Concatenate Celejar
